Answer:
Explanation:
An element with atomic number 18 is a noble gas.
The element with atomic number 19 will have one extra electron so it can donate one electron or shed one electron to attain noble gas configuration .
It tends to shed one electron to become positively charged ion . Hence they are electro-positive elements .
Similarly the element with atomic number 17 will have one short electron so it can gain one electron to attain noble gas configuration .
They tend to gain one electron to become negatively charged ion . Hence they are electro-negative elements . They have high electronegativity .
CaCl₂ is the chemical formula of calcium chloride, and its molar mass is 110.983 g/mol. It is an ionic compound comprising two chlorine anions and calcium cation. The bivalent calcium metal produces an ionic bond with two chlorine atoms. Calcium chloride is found in nature in its hydrated forms. It also occurs in huge concentrations in natural brine from salt deposits and salt lakes.
Calcium chloride is found as granules or flakes, as an odorless white powder. It exhibits a melting point of 782 degree Celsius, density of 2.15 g/ml, and a high boiling point of over 1600 degree Celsius.
The element of Sodium in the periodic table has a large atomic radius than magnesium due to less atomic attraction on the last electron.
<h3 /><h3>What is the atomic radius?</h3>
The atomic radii are given as the distance between the last electron in the shell to the center of the nucleus.
In the periodic table, on moving from the left to right there has been a decrease in the atomic radius of the atom with the addition of an electron in the same shell forming an increase in the nuclear attraction faced by the last electron.
Thus, Sodium has a large atomic radius than magnesium due to the presence of a less nuclear attraction over the last electron.
Learn more about atomic radii, here:
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